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New Compressive Test Methods for GFRP Bars
Glass fibre reinforced polymer (GFRP) bars are now accepted as longitudinal reinforcements for concrete columns. However, code recommendations for designing and analysing concrete columns with GFRP bars are still ignoring their contribution to carrying the axial loads due to the limited understanding of its behaviour under compression, while in some cases; the compressive strength is calculated as a percentage of the tensile strength. This is due to the limited understanding on the compressive behaviour of GFRP bars and the lack of standard testing methodology to characterise the compressive behaviour of the GFRP bars. In this paper, a novel testing methodology is introduced to fulfil the gap in the knowledge on characterising the compressive behaviour of GFRP bars. In the specimen preparation, both ends of the GFRP bars were embedded in hollow steel caps filled with a cementitious grout to facilitate compressive tests and minimise premature failure due to stress concentration at the ends. The effect of the bar diameter (9.5, 15.9, and 19.1 mm) and the slenderness (Lu/db) ratio (2, 4, 8, and 16) were also investigated. The failure mechanisms showed that an increase in the micro-fibre buckling and decrease in the compressive-to-tensile strength ratio could be achieved when the diameter of GFRP bar increases. Furthermore, the compressive strength and mode of failure are highly affected by (Lu/db) ratio. Simplified theoretical equations were also proposed to reliably describe the compressive behaviour of GFRP bars with different bar diameters and slenderness ratios.
New Compressive Test Methods for GFRP Bars
Glass fibre reinforced polymer (GFRP) bars are now accepted as longitudinal reinforcements for concrete columns. However, code recommendations for designing and analysing concrete columns with GFRP bars are still ignoring their contribution to carrying the axial loads due to the limited understanding of its behaviour under compression, while in some cases; the compressive strength is calculated as a percentage of the tensile strength. This is due to the limited understanding on the compressive behaviour of GFRP bars and the lack of standard testing methodology to characterise the compressive behaviour of the GFRP bars. In this paper, a novel testing methodology is introduced to fulfil the gap in the knowledge on characterising the compressive behaviour of GFRP bars. In the specimen preparation, both ends of the GFRP bars were embedded in hollow steel caps filled with a cementitious grout to facilitate compressive tests and minimise premature failure due to stress concentration at the ends. The effect of the bar diameter (9.5, 15.9, and 19.1 mm) and the slenderness (Lu/db) ratio (2, 4, 8, and 16) were also investigated. The failure mechanisms showed that an increase in the micro-fibre buckling and decrease in the compressive-to-tensile strength ratio could be achieved when the diameter of GFRP bar increases. Furthermore, the compressive strength and mode of failure are highly affected by (Lu/db) ratio. Simplified theoretical equations were also proposed to reliably describe the compressive behaviour of GFRP bars with different bar diameters and slenderness ratios.
New Compressive Test Methods for GFRP Bars
Lecture Notes in Civil Engineering
Benmokrane, Brahim (editor) / Mohamed, Khaled (editor) / Farghaly, Ahmed (editor) / Mohamed, Hamdy (editor) / Alajarmeh, Omar (author) / Manalo, Allan (author) / Mohammed, Ali (author) / Benmokrane, Brahim (author) / Mendis, Priyan (author)
2022-09-27
9 pages
Article/Chapter (Book)
Electronic Resource
English